Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1000-1111 pattern in any orientation.
A146686
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1000-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =7a(9) =15a(10) =31a(11) =63a(12) =167a(13) =435a(14) =1337a(15) =5021a(16) =19355a(17) =85901a(18) =388093a(19) =1971221a(20) =10932161
External references
- oeis: A146686